let num1 = 5;
console.log(num1);
let canvas1 = document.querySelector('canvas');
let ctx = canvas1.getContext('2d');
canvas1.width = screen.availWidth;
canvas1.height = screen.availHeight;
let str1 = '我好帅啊啊啊啊';
let arr = new Array(Math.ceil(canvas1.width / 10)).fill(0);
